Elsbury, Katy E, Paytan, Adina, Ostrom, Nathaniel E, Kendall, Carol, Young, Megan B, McLaughlin, Karen, Rollog, Mark E, and Watson, Sue, 2009, Using Oxygen Isotopes of Phosphate To Trace Phosphorus Sources and Cycling in Lake Erie: Environmental Science & Technology, v. 43, iss. 9, p. 3108-3114.